CSS Clearfix

Techniques to clear floats in CSS

初心者でもわかる】clearfixって結局何してるの？ #初心者 - Qiita

Tips To Fix CSS Layout Issue

CSS Guide to Using the Clearfix Hack

Clearfix: esempi, come si usa, tutorial

The Web Dev CSS Crash Course for Beginners -6

what clearfix does: .clearfix { overflow: auto; }

CSS Clearfix Sean C Davis, 46% OFF

Better float containment in IE using CSS expressions – Nicolas Gallagher

CSSのclearfixを完全網羅【初心者でも分かる入門図解付き】 - WEBCAMP

CSS Floats & Clearfix